[U-Boot] [RFC PATCH] kbuild: turn of dtc unit address warnings by default

[Peter Robinson]

On Tue, Mar 7, 2017 at 6:10 PM, Tom Rini <trini at konsulko.com> wrote:
> On Wed, Mar 08, 2017 at 02:09:46AM +0900, Masahiro Yamada wrote:
>> 2017-02-27 15:24 GMT+09:00 Masahiro Yamada <yamada.masahiro at socionext.com>:
>> > DTC 1.4.2 or later checks DT unit-address without reg property and
>> > vice-versa, and generates lots of warnings.  Fixing DT files will
>> > take for a while.  Until then, let's turn off the check unless
>> > building with W=*.
>> >
>> > Introduce a new helper dtc-option to check if the option is supported
>> > in order to suppress warnings on older versions.
>> >
>> > Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
>> > ---
>> >
>> > This is one possible answer to Tom's:
>> > https://www.mail-archive.com/u-boot@lists.denx.de/msg240328.html
>> >
>> > He fixed the problem on travis-ci by commit a0f3e3d, but it is still
>> > annoying during the regular development.
>> > Perhaps we may want to hide the warnings (at least hidden in Linux
>> > Kernel by default).
>> > Or, is it better to keep it noisy
>> > to motivate people to fix their DT files?
>> > I am not quite sure...
>> >
>> > Now I am sending this as RFC patch in case people may want to start discussion.
>> >
>> > BTW, this is a counter-part of the patch I sent to the Kbuild sub-system
>> > (https://patchwork.kernel.org/patch/9592747/)
>> > because I want the U-Boot build system with Linux as much as possible.
>> > Let's see if I will get possible opinions in the Kbuild review.
>>
>> I sent a similar patch for Linux, but
>> the response was negative in the Kbuild subsystem.
>>
>> So, this patch will be our own, if applied.
>
> I think we should be proactive here and take this patch.  Newer dtc will
> be seen more widely I believe as various overlay related changes go in
> upstream.  Do you have anything you would change in a v2 non-RFC?

For reference they updated the kernel included dtc to upstream commit
0931cea3ba20 in 4.11 for overlay support [1] so I similarly updated
the Fedora dtc to the same revision for consistency so I think this is
a pragmatic approach.

Peter

[1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6f05afcbb031722ec1eff77dde188ff2edf8940e